Oracle 游标用For循环比较简单，MySQL也是最近才开始用，感觉稍微麻烦一点，下边直接上代码：

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-- Oracle

-- 内嵌游标为带参游标，参数为外游标值

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DECLARE

cursor cur_outer is select dept_id from tbl_test_dept;

cursor cur_inner(deptid varchar2) is (SELECT user_id FROM tbl_test_user WHERE dept_id=deptid);

BEGIN

FOR DEPT_ITEM IN cur_outer LOOP

--

--

FOR KEY_ITEM IN cur_process(DEPT_ITEM.DEPT_ID) LOOP --开始内循环

--

--

END LOOP;

END LOOP;

commit;

END;

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-- Mysql

-- HANDLER 只能申明一个

-- 内循环结束后需要重置done

-- 发现mysql不能直接执行begin..end，需要创建存储过程后调用执行；

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CREATE PROCEDURE `PROC_CURSOR_TEST`()

BEGIN

DECLARE done INT DEFAULT FALSE;

DECLARE item_outer VARCHAR(50);outer

DECLARE item_inner VARCHAR(50);

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

-- 定义内外游标

DECLARE cur_outer cursor for select dept_id from tbl_test_dept;

DECLARE cur_inner cursor for (SELECT user_id FROM tbl_test_user WHERE dept_id=item_outer);-- 查询条件可直接用外游标变量值

OPEN cur_outer;

out_loop: LOOP

fetch cur_outer into item_outer;

IF  done THEN -- 判断是否继续循环

LEAVE out_loop;

END IF;

--

--

OPEN cur_process; -- 打开内嵌游标

inner_loop: LOOP

fetch cur_inner into item_inner;

IF  done THEN

LEAVE inner_loop;

END IF;

--

--

end loop;

CLOSE cur_inner;

SET done = 0;  -- 关闭内游标，重置done

end loop;

CLOSE cur_outer;

commit;

END;

call PROC_CURSOR_TEST(); -- 调用存储过程

drop procedure PROC_CURSOR_TEST; --删除